Synonyms for circadian
sɜrˈkeɪ di ən, ˌsɜr kəˈdi əncir·ca·di·an

Princeton's WordNet

1. circadianadjective

   of or relating to biological processes occurring at 24-hour intervals

   "circadian rhythms"

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How to use circadian in a sentence?

1. Nick Littlehales:

   The phone I'm talking to you on now was simply a mobile phone when I was walking around Manchester United football club in 1998 -- it is now used for so many different things, they have a counter-productive effect on a very natural process called our circadian rhythms, which has so many biological consequences in our bodies.

2. Sally Augustin:

   Being exposed to daylight helps keep your stress levels and your circadian rhythm in check.

3. Daniel Smith:

   By 2030, two-thirds of the world's population will be living in cities, and we know that living in an urban environment can be pretty toxic to Aiden Doherty circadian system because of all the artificial light that Aiden Doherty're exposed to, so we need to think about ways to help people tune in to their natural rhythms of activity and sleeping more effectively. Hopefully, that will protect a lot of people from mood disorders.

4. Nan Hee Kim:

   These results support the importance of circadian rhythms in metabolic regulation.

5. Jamie Zeitzer:

   In essence, using the night before you traveled from California to New York would move your circadian system two-thirds of the way there before you even left.